Tsarnaev, 19, is charged with 30 federal counts for the bombings that killed three people and injured more than 260 at the finish line of the Boston Marathon on April 15, 2013. A Massachusetts Institute of Technology police officer was also killed three days later during a massive manhunt for Tsarnaev and his older brother Tamerlan, 26, who was killed in a shootout with the police. Tsarnaev was later captured by the police.

A makeshift memorial near the finish line of the Boston Marathon bombings for the three people who were killed.

The federal death penalty has been authorized for around 500 defendants since it was reinstated in 1988. Of the 500, only three have been executed, The New York Times reported.

Holder will consider factors such as the strength of evidence against Tsarnaev, the role he played in the capital offense, prior criminal records, whether Tsarnaev has accepted responsibility for his conduct and the views of the victims' families.

...he must decide whether the aggravating factors that might justify death in this case, like the indiscriminate killing and maiming of innocent people, outweigh any mitigating factors, such as the possibility that Mr. Tsarnaev, who was 19 at the time, was under the sway of his older brother.